Thin Lens Formula and Lens Maker Formula NEET Questions

Physics - Optics

Thin Lens Formula and Lens Maker Formula MCQ Questions


7.
If a convex lens has a focal length of 50 cm, its power is:
A.
+2D
B.
-2D
C.
+1D
D.
-1D
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ANSWER :
A. +2D
8.
What happens to the focal length of a convex lens if it is placed in water?
A.
It increases
B.
It decreases
C.
Remains unchanged
D.
Becomes zero
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ANSWER :
B. It decreases
9.
A convex lens behaves as a converging lens when:
A.
In air
B.
In vacuum
C.
In water
D.
In glass
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ANSWER :
A. In air
10.
Which type of lens is used to correct myopia?
A.
Convex lens
B.
Concave lens
C.
Cylindrical lens
D.
Bifocal lens
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ANSWER :
B. Concave lens
11.
What is the nature of the image formed by a concave lens?
A.
Always real and erect
B.
Always virtual and inverted
C.
Can be real or virtual
D.
None of these
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ANSWER :
B. Always virtual and inverted
12.
Which of the following statements is correct for a convex lens?

NEET - 2020

A.
It always forms a real image
B.
It always forms a virtual image
C.
It can form both real and virtual images
D.
It cannot form an image
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ANSWER :
C. It can form both real and virtual images