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JEE Mains Previous Years Questions with Solutions

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1

AIEEE 2002

MCQ (Single Correct Answer)
which of the following is used in optical fibres?
A
total internal reflection
B
scattering
C
diffracttion
D
refraction

Explanation

In an optical fibre, light is sent through the fibre without any loss by the phenomenon of total internal reflection as shown in the figure.
2

AIEEE 2002

MCQ (Single Correct Answer)
Wavelength of light used in an optical instrument are $${\lambda _1} = 4000\mathop A\limits^ \circ $$ and $${\lambda _2} = 5000\mathop A\limits^ \circ ,$$ then ratio of their respective resolving powers (corresponding to $${\lambda _1}$$ and $${\lambda _2}$$ ) is
A
$$16:25$$
B
$$9:1$$
C
$$4:5$$
D
$$5:4$$

Explanation

$${{{{\left( {R.P} \right)}_1}} \over {{{\left( {R.P} \right)}_2}}} = {{{\lambda _2}} \over {{\lambda _1}}} = {5 \over 4}$$
3

AIEEE 2002

MCQ (Single Correct Answer)
If two mirrors are kept at $${60^ \circ }$$ to each other, then the number of images formed by them is
A
$$5$$
B
$$6$$
C
$$7$$
D
$$8$$

Explanation

KEY CONCEPT : When two plane mirrors are inclined a each other at an angle $$\theta $$ then the number of the images of a point object placed between the plane mirrors is

$${{{{360}^ \circ }} \over \theta } - 1,\,\,if{{{{360}^ \circ }} \over \theta }$$ is even

$$\therefore$$ Number of images formed

$$ = {{{{360}^ \circ }} \over {{{60}^ \circ }}} - 1 = 5$$
4

AIEEE 2002

MCQ (Single Correct Answer)
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.

Questions Asked from Ray & Wave Optics

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