Q1.
Identify the optical device if an object is placed between the device and its focus and image formed is virtual, erect and enlarged and formed behind the device.
Q2.
What is the minimum number of rays required for locating the image formed by a concave mirror for an object? How many rays can actually emerge from an object?
Q3.
Draw a ray diagram to show the formation of a virtual image by a concave mirror.
Q4.
Draw ray diagrams for the following cases when a ray of light
(a) passing through the centre of curvature of a concave mirror is incident on it.
(b) parallel to principal axis is incident on concave mirror
(c) is incident at the pole of a concave mirror
(d) passing through the focus of a concave mirror incident on it.
Q5.
It is desired to obtain an erect image of an object, using a concave mirror of focal length 20 cm.
(i) What should be the range of distance of the object from the mirror?
(ii) Will the image be bigger or smaller than the object?
(iii) Draw a ray diagram to show the image formation in this case.
Q6.
What is the nature of incident rays when the object is at infinity?
Q7.
Draw a ray diagram to show the formation of same sized image by a concave mirror.
Q8.
Two light rays P and Q are incident on an optical device ′X′ which finally goes along ′R′ and ′S′. Identify optical device ′X′.
