Magnification, Power of a Lens, Combination of thin lenses in contact. Refraction of light... NEET Questions

Physics - Optics

Magnification, Power of a Lens, Combination of thin lenses in contact. Refraction of light... MCQ Questions


1.
What is the magnification formula for a convex lens?
A.
m = v/u
B.
m = u/v
C.
m = f/u
D.
m = v/f
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ANSWER :
A. m = v/u
2.
What does a negative magnification indicate in a lens system?
A.
The image is real and inverted
B.
The image is virtual and erect
C.
The image is magnified
D.
The image is diminished
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ANSWER :
A. The image is real and inverted
3.
Which of the following defines the power of a lens?
A.
P = 1/f
B.
P = f
C.
P = f^2
D.
P = 1/f^2
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ANSWER :
A. P = 1/f
4.
If two thin lenses of powers +5D and -2D are placed in contact, what is the net power?
A.
+3D
B.
+7D
C.
+2D
D.
-3D
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ANSWER :
A. +3D
5.
Magnification produced by a convex lens is positive when:

NEET - 2015

A.
Object is at focus
B.
Object is at infinity
C.
Object is between focus and optical center
D.
Object is beyond 2F
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ANSWER :
C. Object is between focus and optical center
6.
Which lens combination results in a converging effect?
A.
Concave + Convex
B.
Convex + Convex
C.
Concave + Concave
D.
Convex + Concave
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ANSWER :
B. Convex + Convex