A. f2 + f1
B. f2 – f1
C. f1f2/f2+f1
D. f1f2/f1-f2
0
If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?
0
The least distance of distinct vision for a normal eye is_______________?
A. chromatic aberration
B. spherical aberration
C. both spherical and chromatic
D. distortion
0
Magnifying power of simple microscope______________?
A. 15 cm
B. 25 cm
C. 30 cm
D. 40 cm
0
If an object is placed away from 2f of a converging lens then the image will be_______________?
A. increase with increase in focal length
B. increase with decrease in focal length
C. no effect with decrease or increase with focal length
D. list distance of distinct vision
0
The power of a concave lens is_______________?
A. real and erect
B. virtual and erect
C. real and inverted
D. virtual
0
Unit of power of a lens is________________?
A. real
B. virtual
C. positive
D. negative
0
The diameter of a lens is called________________?
A. meter
B. watt
C. diopter
D. horsepower
0
A lens which converges a beam of parallel rays to a point is called______________?
A. focal length
B. principal axis
C. aperture
D. radius of curvature
0
A. diverging (or concave) lens
B. converging (or convex) lens
C. plano concave lens
D. plano convex lens
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