Consider sunlight incident on a slit of width \({ 10 }^{ 4 }\)A. The image seen through the slit shall darkness as observed through the polaroid

1

(a)

Be a fine sharp slit white in colour at the centre

(b)

A bright slit white at the centre diffusing to zero intensities at the edges 

(c)

A bright slit white at the centre diffusing to regions of different colours

(d)

only be a diffused slit white in colour

In a young's double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

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(a)

There shall be alternate interference pattern of red and blue

(b)

There shall be alternate interference pattern of red distinct from that for  blue

(c)

There shall be no interference fringes

(d)

There shall be alternate interference pattern of red mixing with one for  blue

The ratio of the speed of an object to the speed of its real image of magnification m in the case of a convex mirror is

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(a)

\(-\frac { 1 }{ { m }^{ 2 } } \)

(b)

\({ m }^{ 2 }\)

(c)

-xm

(d)

\(\frac { 1 }{ { m } } \)

In a concave mirror, an object is placed at a distance \({ d }_{ 1 }\) from the focus and the real image is formed at a distance \({ d }_{ 2 }\) from the focus. then the focal length of the mirror is:

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(a)

\(\sqrt { { d }_{ 1 }{ d }_{ 2 } } \)

(b)

\({ d }_{ 1 }{ d }_{ 2 }\)

(c)

\({ { (d }_{ 1 }{ /d }_{ 2 }) }^{ /2 }\)

(d)

\(\sqrt { { d }_{ 1 }{ /d }_{ 2 } } \)

Which is not true for the image formed in a plane mirror? The image is 

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(a)

virtual

(b)

erect

(c)

laterally inverted

(d)

closer to the mirror than the object

What is the meant by accommodation of the eye?

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(a)

It is the ability of the eye to observe distinctly the objects situated at widely different distance from the eye.

What is range of vision?

1

(a)

Range of the vision is the distance between near point and far point of eye.

For double refracting crystal the refractive indices , for the ordinary and extraordinary denoted by µo and µe. What is the relation valid along the optical axis of the crystal.

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(a)

\({ \mu }_{ 0 }={ \mu }_{ e }\)