why danger signals are made of red colours
A STUDENT OBTAINS A BLURRED IMAGE OF AN OBJECT ON A SCREEN BY USING CONCAVE MIRROR. IN ORDER TO OBTAIN A SHARP IMAGE ON THE SCREEN, WHERE HE WILL HAVE TO SHIFT THE MIRROR?
5 cm in length is held 25 cm away from a converging lens of focal
length 10 cm. Draw the ray diagram and find the position, size and
the nature of the image formed.
A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum. Explain why is it so.
When an object is placed 20cm from a concave mirror , a real image magnified three times is formed. Find:
(a) focal length of the mirror.
(b) where must the object be placed to give a virtual image three times the height of the object?
A lens of focal length "f" is cut into two equal parts without affecting its curvature.the two pieces will have equal focal length of : A) f. B) 2f. C) f/2. D) f/3
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