if a convex lens of focal length 20cm and a concave lens of focal length 30cm kept in contact with each other first what will be the focal length of the combination second what will be the power of the combination third what will be the behaviour of the combination
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According to newton’s first law of motion, which force is expected to cause a body to accelerate?
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Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.
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if a convex lens of focal length 20cm and a concave lens of focal length 30cm kept in contact with e...
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