A blue filter absorbs the blue light as white light passes through it.
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Q17: A lens of focal length 90 mm
Q18: Situation 19.3
The angular magnification of a refracting
Q19: A myopic girl wears eyeglasses that allow
Q20: A lens of focal length 40 mm
Q21: The objective lens of an astronomical telescope
Q23: The objective and the eyepiece of
Q24: If red light and violet light both
Q25: Situation 19.3
The angular magnification of a refracting
Q26: To give large magnification,a telescope should have
A)an
Q27: In a compound microscope
A)both the objective and
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