### JEE Mains Previous Years Questions with Solutions

4.5
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1

### AIEEE 2002

Electromagnetic waves are transverse in nature is evident by
A
polarization
B
interference
C
reflection
D
diffraction

## Explanation

The phenomenon of polarisation is shown only by transverse waves.
2

### AIEEE 2002

An astronomical telescope has a large aperture to
A
reduce spherical aberration
B
have high resolution
C
increase span of observation
D
have low dispersion

## Explanation

KEY CONCEPT : The resolving power of a telescope

$R.P = {D \over {122\lambda }}$ where $D=$ diameter of the objective lens

$\lambda =$ wavelength of light.

Clearly, larger the aperture, larger is the value of $D,$

more is the resolving power or resolution.