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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