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


7.
Which equation represents the combination of thin lenses in contact?
A.
1/F = 1/f1 + 1/f2
B.
1/f = 1/f1 - 1/f2
C.
f = f1 + f2
D.
f = f1 - f2
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ANSWER :
A. 1/F = 1/f1 + 1/f2
8.
If the power of a convex lens is +5D, its focal length is:

NEET - 2016

A.
20 cm
B.
50 cm
C.
5 cm
D.
10 cm
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ANSWER :
B. 50 cm
9.
What is the critical angle for refraction through a prism?
A.
90°
B.
45°
C.
Greater than 60°
D.
180°
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ANSWER :
C. Greater than 60°
10.
Which factor determines the angle of deviation in a prism?
A.
Wavelength of light
B.
Refractive index of material
C.
Thickness of prism
D.
Density of material
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ANSWER :
B. Refractive index of material
11.
Two thin lenses of power +3D and -2D are placed in contact. The effective power is:

NEET - 2017

A.
+1D
B.
-1D
C.
+5D
D.
-5D
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ANSWER :
A. +1D
12.
For a microscope, the magnifying power is given by:
A.
M = D/f
B.
M = f0/fe
C.
M = (1 + D/f)
D.
M = f0 - fe
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ANSWER :
A. M = D/f