Q5 of 25 Page 10

Define 1 Dioptre of power of a lens. ( CBSE 2010)

1 Dioptre is the power of a lens whose focal length is 1m.

i.e.  

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3

Find the power of a concave lens of focal length 2 m. ( CBSE 2011)

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What does the negative sign in the value of magnification produced by a mirror indicates about an image? ( CBSE 2009)

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Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in a vacuum is 3 × 108 m s–1. ( CBSE 2011)

 7

An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens. ( CBSE 2013, 2012)