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Ray Optics and ...

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  • Question 1
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    A plano-convex lens acts like a concave mirror of 28 cm focal length when its plane surface is silvered and like a concave mirror of 10 cm focal length when its curved surface is silvered. What is the refractive index of the material of the lens?

  • Question 2
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    A pin is placed 10 cm in front of a convex lens of focal length 20 cm and refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature of 22 cm. How far from the lens is the final image formed?

  • Question 3
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    A telescope, when in normal adjustment, has a magnifying power of 6 and the objective and the eye-piece are 14 cm apart The focal lengths of the eye-piece and the objective respectively are

  • Question 4
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    Magnifying power of a compound microscope is high if

  • Question 5
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    The magnifying power of telescope is high if

  • Question 6
    1 / -0

    A lens of power + 2.0 D is placed in contact with another lens of power – 1.0 D. The combination will behave like

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