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  • Question 1
    1 / -0.25

    The lens maker’s formula is only valid for

  • Question 2
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    When an object is placed at near point 25 cm by using a convex lens of focal length 5 cm. How much magnification can be obtained?

  • Question 3
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    A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of

  • Question 4
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    Two convex lenses with power 2 diopter are kept in contact with each other. The focal length of the combined lens system is

  • Question 5
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    A concave lens has a focal length of 20 cm. At what distance the image be formed from the lens if the object is placed at a distance of 40 cm from the lens.

  • Question 6
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    A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

  • Question 7
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    At sun rise and sun set the sky near the sun looks red due to _____?

  • Question 8
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    If μ1 is the refractive index of core and μ2 is the refractive index of cladding, then correct relation for the propagation of light in fibre is:

  • Question 9
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    If the critical angle for total internal reflection from a medium to vacuum is 30∘. Then the speed of light in the medium is

  • Question 10
    1 / -0.25

    An object is at a distance of 0.5 m in front of a plane mirror. Distance between the object and image is 

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