In the figure. shown- a slab of refractive index `(3)/(2)` is movedat speed 1m/s towards a stationary observer. A point 'P' is observed by the observer with the help of paraxial rays through the slab. Both 'O' and observer lie in air. The velocity with which the image will moveis:

(a) In the figure shown a slab of refractive index (3)/(2) is moved toward a stationary observer with speed 6 cm//s . A point O is observed by the observer with the help of paraxial rays through the slab. Both O and observer lie in are. Find the velocity (in cm//s ) with which the image will appear to move to observer. (b) in the previous question if the object moves towards rigth with a velocity of 6 cm//s and find the velocity of the final image (in cm//s ) as seen by observer :

A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is v m / sec . The speed of source will be

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n_(1) ,the value of n_(1)//n is

When a source of frequency f_(0) moves away from a stationary observer with a certain velocity, an apparent frequency f' is observed. When it moves with the same speed towards the observer, the observed frequecy is 1.2 f' . If the velocity of sound is v, then the acutual frequency f_(0) is

A speaker emits a sound wave of frequency f_(0) . When it moves towards a stationary observer with speed u, the observer measures a frequency f_(1) . If the speaker is stationary, and the observer moves towards it with speed u, the measured frequency is f_(2) . Then -

A 20cm thick glass slab of refractive index 1.5 is kept in front of a plane mirror. Find the position of the image (relative to mirror) as seen by an observer through the glass slab when a point object is kept in air at a distance of 40 cm from the mirror.