Can we increase the range of a telescope by increasing the diameter of the objective lens?

2

(a)

A man stands in front of a mirror of special shape. He finds that his image has a very small head, a fat body and legs of normal size. What can you say about the shapes of three parts of the mirror? 

2

(a)

For the same angle of incidence, the angles of refraction in media P, Q and R are \(35°,25°,15°\) resp. In which medium will the velocity of light be minimum? 

2

(a)

A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the lens is reversed, will the position of the image change? 

2

(a)

Is Huygen's principle valid for longitundinal sound waves?

2

(a)