Short Answer TypeLight passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why?
In a rectangular glass slab, the emergent ray is parallel to the incident ray but they are not along the same line whereas in a prism the emergent ray is not parallel to the incident ray. This is because, in a glass block the two surfaces at which refraction occurs and is parallel to each other.
Ranbir claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give a reason for your answer.
A lens forms an erect, magnified and virtual image of an object.
i) Name the lens.
ii) Draw a labeled ray diagram to show the image formation.i) Define the power of a lens.
ii) The lens mentioned in 6 (b) above is of focal length 25 cm.i) Name a prism required for obtaining a spectrum of ultraviolet light.
ii) Name the radiation which can be detected by a thermopile.A type of electromagnet wave has wavelength 50 A.
i) Name the type of wave.
ii) What is the speed of the wave in vacuum?
iii) State one use of this type of the wave.
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