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Chapter 12

Geometrical optics

Encircle the most appropriate answer from the following options :

(1) Plank suggested that light consists of small packets of energy called:

(a) Electrons

(b) Neutrons

(c) Photons

(d) Positrons

(2) The angle between incident ray and normal N is;

(a) Angle of reflection

(b) Angle of incidence

( c) Angle of refraction

(d) Normal angle

(3) Angle of incidence is represented by

(a) Deficiency of protons

(b) more than protons

(c) Deficiency of electrons

(d) more than electrons

(4) The angle between the normal and thus the reflected ray is known as angle of

(a) Reflection

(b) Refraction

(c) Incidence

(d) Diffraction

(5) The incident ray, the normal , and thus the reflected ray at the aim of incidence all dwell the

(a) opposite direction

(b) Saille plane

(c) x and y axis

(d) y & z – axis

(6) consistent with law of reflection

(a) i > r

(b) i < r

(c) r > i

(d) I = r

(7) Regular reflection is reflection by the

(a) Rough surface

(b) Smooth surface

(c) Irregular surface

(d) Smooth and rough surfaces

(8) The rough surfaces of object reflect the rays of sunshine in many directions is named

(a) Regular reflection

(b) efraction

(c) refraction

(d) Interférence

(9) In concave mirror the surface is reflecting;

(a) Outer surface

(b) Outer curved

(c) Inner curved surface

(d) Side of the mirror

(10) Which statement is wrong about concave mirrors?

(a) Size of image depends upon position of the thing

(b) Both virtual and real images can form

(c) Inner surface of spherical mirror is reflecting

(d) Only virtual Images are formed

(11) A spherical mirror whose outer curved surfaces reflecting called

(a) concave mirror

(b) convex mirror

(c) concave lens

(d) convex lens

(12) Which statement is correct about convex mirrors?

(a) Size of image is smaller than object

(b) Only virtual erect image is made

(c) Outer curved surface is reflecting

(d) All of the given statements are true

(13) Vertex is that the midpoint of the curved surface of spherical mirror is additionally called

(a) Radius of curvature

(b) principal axis

(c) Pole

(d) Principal focus

(14) A line joining centre of curvature and pole of the spherical mirror is

(a) principal axis

(b) principal focus

(c) Centre of curvature

(d) Pole

(15) the space from the pdle to the principal focus measured along the optic axis is

(a) Principal focus

(b) Radius of curvature

(c) focal distance

(d) Diameter

(16) the connection between object distance p, image distance q from the mirror and focal distance of the mirror is called;

(a) Mirror focal length

(b) Distance mirror

(c) Mirror formula

(d) Lens formula

(17) Long sightedness is removed by

(a) convex mirror

(b) Concave mirror

(c) convex lens

(d) concave lens

(18) focal distance of spherical mirror is

(a) R/4

(b) R/2

(c) R/3

(d) R/9

(19) Convex mirror produce images

(a) Larger than object

(b) Smaller than object

(c) equal to object

(d) Very large in size

(20) The bending of sunshine because it passes from one transparent medium into another is

(a) Reflection

(b) Refraction

(c) Reverberation

(d) incidence

(21)      Short sighted may be due to eyeball being                                         

(a) too long   

(b) too short    

(c) too thick

(d) too thin   

(22)      Have the ability to move the eye lens forward or backward.

(a) Fish          

(b) Human      

(c) Birds

(d) Dog

(23)      The nearsighted eye can be corrected by using;                              

(a) diverging lens     

(b) converging lens    

(c) both A & B

(d) Concave mirror

(24) The speed of light is greater in:

(a) Air

(b) water

(c) solid

(d) glass

(25)  When people cannot see distant objects q,clearly without the aid of spectacles the   defect of vision is;

(a) Short-sighted   

(b) near-sightedness

(c) both A & B

(d) Farsightedness

(26) speed of light in vacuum / speed of light in medium =?

(a) Reflective index

(b) Snell’s law 

(c) Refractive index

(d) Critical angle

(27)      When a ray of light comes from a denser medium to a rarer medium

(a) It bends towards normal

(b) It bends away from the normal

(c) It bends toward Inside      

(d) None of these

(28)      The angle of incidence that causes the refracted ray in the rarer medium to bend through is called

(a) Critical     

(b) Angle of incidence

(c) Angle of reflection

(d) Angle of refraction 

(29)      No refraction occurs when the angle of incidence is

(a) Smaller than the critical angle      

(b) Larger than the critical angle

(c) Equal to the critical angle 

(d) Very small than the critical angle

(30)      The line passed through the two centres of curvatures of the lens is known as

(a) Principal focus      

(b) Optical centre       

(c) Principal axis      

(d) Focal length 

(31)      Optical centre is represented by

(a) A

(b) f

(c) F

(d) C

(32) For a concave lens, the parallel rays appear to come from a point behind the lens is called;  

(a) Principal focus

(b) Principal axis

(c) Focal length

(d) Optical length

(33) The distance of the optical centre and the principal focus is. 

(a) Principal focus      

(b) Principal axis        

(c) Focal length        

(d) Optical length

(34)      It is n transparent body (made of optical glass) with at least two polished plane faces inclined towards each other from which light is refracted;       

(a) prism        

(b) camera     

(c) lens

(d) mirror

(35)      In lens number of curved surfaces at least;

(a) two

(b) three         

(c) one

(d) four         


(36)      Lenses are used in optical devices;

(a) camera     

(b) eyeglasses

(c) microscope

(d) all given 

(37)      The lens which causes incident parallel rays to converge at a point is;

(a) convex lens          

(b) converging lens    

(c) both a & b

(d) concave lens      


(38)      Lens thick at the centre but thin at the edges is;

(a) concave    

(b) convex     

(c) diverging   

(d) plane

(39)      SI unit of power of lens is:

(a) meter        

(b) diopted

(c) centimeter

(d) millimeter

(40).   This is called changing the focal length of the eye lens.

(a) Variation   

(b) Accommodation

(c) Magnification   

(d) Resolution

(41)      It has positive focal length;

(a) simple lens

(b) concave lens        

(c) convex lens         

(d) none of above

(42)      In mirrors images are formed through reflection, but lenses form images through; 

(a) refraction 

(b) incidence  

(c) diffraction 

(d) reflection

(43)      In case of convex lens when object is’ placed beyond 2F,the image is formed;

(a) between F and 2F

(b) real, inverted         

(c) smaller than object

(d) all of these

(44)      The image with ‘Convex lens is formed inverted, thé same size as the object when the object is placed at:

(a) 2F

(b) between F and 2F

(c) F

(d) C

(45)      When object is at É the image is;

(a) inverted     

(b) real

(c) small         

(d) not formed      


(46)   The coloured portion of the eye controls the amount of light reaching the retina.

 (a) Iris   

(b) Pupil   

(c) Cornea   

(d) eye lens

(47) For a converging lens F is:

(a) negative    

(b) positive

(c) some time negative and some time positive

(d) smalter      

(48)      The study of behaviour of light is called;       

(a) optics       

(b) geometry  

(c) plastna      

(d) geometrical optics

(49)      If the object is on the right side of the lens then p is;

(a) positive     

(b) negative   

(c) smaller      

(d) larger

(50)      Optical device is;

 (a) camera    

(b) slide projector       

(c) pho graph enlarger

(d) all of given

(51)      Which statement is correct about the image formed by the camera?

(a) Real image is formed       

(b) Inverted image is formed

(c) Diminished image is formed        

(d) All options are true

(52)      In case of photograph enlarger the object is placed at distance;

(a) more than F          

(b) less than 2F          

(c) both A and B       

(d) more than 3F

(53)      The working principle of photograph enlarger is the same as’,

(a) light pipe

(b) Telescope

(c) Microscope          

(d) Projector           


(54).      It is used to explore the interior organs of the body?                                      

(a) Telescope

(b) Endoscope

(c) Microscope                                     

(d) Projector

(55)      It is an optical instrument which is used to observe distant objects using lens or mirror;

(a) microscope           

(b) Kaleidoscope        

(c) Telescope

(d) Light microscope