Draw ray diagrams showing the image formation by a convex lens when an object is placed:
At infinity.

A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it. Where is the image located?

1. Find the nature, position and magnification of the images formed by a convex lens of focal length 0.20 m if the object is placed at a distance of:

1. 0.50m
2. 0.25m
3. 0.15m

2. Which of the above cases represents the use of convex lens in a film projector, in a camera, and as a magnifying glass?

Describe the nature of image formed when the object is placed at a distance of 20cm from a concave mirror of focal length 10cm.

Why does a ray of light passing through the centre of curvature of a concave mirror gets reflected along same path after reflection?

How could you find the focal length of a convex lens rapidly but approximately?

An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?