Subject

Physics

Class

CBSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

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41.

Explain two advantages of a reflecting telescope over a refracting telescope.


  1. Spherical and chromatic abbreviation eliminated.
  2. Objective lenses are large and expensive in refracting telescope, where as reflecting telescope is economical.

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42.

Define a wavefront. Using Huygens’ principle, verify the laws of reflection at a plane surface.


43.

In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band ? Explain.


44.

When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the obstacle. Explain why


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45.

Obtain the mirror formula and write the expression for the linear magnification.


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