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A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Image formed by a convex ______ is always virtual and smaller in size.
The letter F is placed in front of a plane mirror:
What is the name of the phenomenon involved?
How is the focal length of a spherical mirror related to its radius of curvature?
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
