Ray Optics (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 91  95 of 105
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Question number: 91
» Ray Optics » Reflection and Refraction of Light » Smooth Surface
Question
The light reflected by a plane mirror will not form a real image
(1) If the rays incident on the mirror are diverging
(2) Under no circumstances
(3) If the object is real
(4) If the rays incident on the mirror are converging
Select the correct answers and mark it according to the following codes:
Codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  2 and 4 are correct 

c.  1 and 3 are correct 

d.  1, 2 and 3 are correct 

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Question number: 92
» Ray Optics » Power of a Lens
Question
If the focal length of a magnifier is 5 cm find the magnifying power of the lens for relaxed and strained eye.
Choices
Choice (4)  Response  

a.  2×, 3× 

b.  4×, 5× 

c.  l×, 2× 

d.  4×, 2× 

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Question number: 93
» Ray Optics » Lens Maker's Formula and Lens Formula
Question
A pin is placed 10 cm in front of a convex lens of focal length 20 cm, made of material having refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature 22 cm. determine the position of the final image.
Choices
Choice (4)  Response  

a.  31 cm in front 

b.  11 cm in front 

c.  15 cm in front 

d.  21 cm in front 

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Question number: 94
» Ray Optics » Reflection and Refraction of Light » Spherical Surface
Question
Two plane mirrors are placed at an angle a so that a ray parallel to one mirror gets reflected parallel to the second mirror after two consecutive reflections. The value of a will be
Choices
Choice (4)  Response  

a.  30° 

b.  60° 

c.  75° 

d.  90° 

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Question number: 95
» Ray Optics » Reflection and Refraction of Light » Spherical Surface
Question
Two plane mirrors are inclined at an angle of 30°. Then the first four images of an object O placed between the two mirrors are correctly represented by
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

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