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1) Which mirror is to be used to obtain a parallel beam of light from a small lamp?
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2) The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?
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3) In the interference pattern, energy is
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4) When viewed in white light, soap bubbles show colours because of
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5) Young's experiment established that
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6) A beam of light travelling at a velocity of V m/s is incident at an angle 45° on a glass. Slab of refractive index 1.5. What is the velocity of the beam of light inside the slab?
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7) Angular separation between two colours of the spectrum depends upon
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8) Which of the following form (s) a virtual and erect image for all position of the object?
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9) Which one of the following is used to remove astigmatism for a human eye?
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10) A plane glass slab is placed over various coloured letters, The letter which appears least raised is
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