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Question
Define the following term in relation to concave mirror.
Focal length
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Solution
The linear distance between the pole and the principal focus is called focal length.
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RELATED QUESTIONS
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.
Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
What is a spherical mirror?
The sun is seen before the sunrise and after the sunset.
Define the following term in relation to concave mirror.
Aperture
Draw a ray diagram to show that a convex mirror has a wider field of view.
