Ray Optics

A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in

Q: A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in

(a) A larger angle to be subtended by the object at the eye and hence, viewed in greater detail

(b) The formation of a virtual erect image

(c) Increase in the field of view

(d) Infinite magnification at the near point

Ans: (a) & (b)

Between the primary and secondary rainbows, there is a dark band known as Alexandra’s dark band. This is because

Q: Between the primary and secondary rainbows, there is a dark band known as Alexandra’s dark band. This is because

(a) Light scattered into this region interfere destructively

(b) There is no light scattered into this region

(c) Light is absorbed in this region

(d) Angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately 42° and 50°

Ans: (a) & (d)

A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB figure. when observed from the face AD, the pin shall

Q: A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB figure. when observed from the face AD, the pin shall

Numerical

(a) Appear to be near A

(b) Appear to be near D

(c) Appear to be at the centre of AD

(d) Not be seen at all

Consider an extended object immersed in water contained in a plane trough. When seen from close to t edge of the trough the object looks distorted because

Q: Consider an extended object immersed in water contained in a plane trough. When seen from close to t edge of the trough the object looks distorted because

(a) The apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge

(b) The angle subtended by the image of the object at the eye is smaller that the actual angle subtended by the object in air

(c) Some of the points of the object far away from the edge may not be visible because of total internal reflection

(d) Water in a trough acts as a lens and magnifies the object

Ans: (a) , (b) & (c)

There are certain material developed in laboratories which have a negative refractive index figure. a ray incident from air (Medium 1) into such a medium (Medium 2) shall follow a path given by

Q: There are certain material developed in laboratories which have a negative refractive index figure. a ray incident from air (Medium 1) into such a medium (Medium 2) shall follow a path given by

(a) Numerical

(b) Numerical

(c) Numerical

(d) Numerical

Ans: (a)