Fill in the blanks:

(a) An image that cannot be obtained on a screen is called ________.

(b) Image formed by a convex ________ is always virtual and smaller in size.

(c) An image formed by a ________ mirror is always of the same size as that of the object.

(d) An image which can be obtained on a screen is called a _______image.

(e) An image formed by a concave ________cannot be obtained on a screen.

Which type of lens forms always a virtual image?

A virtual image larger than the object can be produced by a

(i) concave lens

(ii) concave mirror

(iii) convex mirror

(iv) plane mirror

David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be

(i) 3 m

(ii) 5 m

(iii) 6 m

(iv) 8 m

The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be

(i) 1 m/s

(ii) 2 m/s

(iii) 4 m/s

(iv) 8 m/s