Physics MCQs

Page No. 15

In multimode step index fibre the refractive index of core and cladding is____________?


asame


bdifferent


czero


ddifferent with refractive index of core higher than cladding



A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?


af2 + f1


bf2 – f1


cf1f2/f2+f1


df1f2/f1-f2


View Answer f1f2/f1-f2

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______________?


a chromatic aberration


b spherical aberration


cboth spherical and chromatic


ddistortion



The least distance of distinct vision for a normal eye is_______________?


a15 cm


b 25 cm


c30 cm


d40 cm


View Answer 25 cm

Magnifying power of simple microscope______________?


a increase with increase in focal length


bincrease with decrease in focal length


cno effect with decrease or increase with focal length


d list distance of distinct vision



If an object is placed away from 2f of a converging lens then the image will be_______________?


areal and erect


bvirtual and erect


creal and inverted


dvirtual


View Answer real and inverted

The power of a concave lens is_______________?


areal


bvirtual


c positive


dnegative


View Answer negative

Unit of power of a lens is________________?


a meter


bwatt


cdiopter


d horsepower


View Answer diopter

The diameter of a lens is called________________?


afocal length


bprincipal axis


caperture


dradius of curvature


View Answer principal axis

A lens which converges a beam of parallel rays to a point is called______________?


adiverging (or concave) lens


bconverging (or convex) lens


cplano concave lens


dplano convex lens



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