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प्रश्न
If the radius of curvature of a concave mirror is 20 cm, its focal length is:
विकल्प
10 cm
20 cm
40 cm
80 cm
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उत्तर
10 cm
APPEARS IN
संबंधित प्रश्न
A student wants to project the image of a candle flame on a screen 48 cm in front of a mirror by keeping the flame at a distance of 12 cm from its pole.
(a) Suggest the type of mirror he should use.
(b) Find the linear magnification of the image produced.
(c) How far is the image from its object?
(d) Draw ray diagram to show the image formation in this case.
A student has obtained the image of a distant object with a concave mirror to determine its focal length. If he has selected a well-illuminated red building as object, which of the following correctly describes the features of the image formed?
(A) Virtual, inverted and diminished image in red shade
(B) Real, erect and diminished image in pink shade
(C) Real, inverted and diminished image in red shade
(D) Virtual, erect and enlarged image in red shade
What is a spherical mirror?
Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable rays:
At what distance from a concave mirror focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall?
A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it. Find the nature, position and size of the image formed.
Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:
Pick out the concave and convex mirrors from the following and tabulate them.
Rear-view mirror, Dentist’s mirror, Torchlight mirror, Mirrors in shopping malls, Make-up mirror.
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
Examine the above figure and state which of the following option is correct? [one small box in the figure is equal to 1 cm]
