NCERT Exemplar I — task. Science CBSE, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1. Which of the following can make a parallel beam of light when light from a point source is incident on it?

Convex mirror as well as a concave lens
Concave mirror as well as a concave lens
Two plane mirrors placed at 90° to each other
Concave mirror as well as convex lens

2. Under which of the following conditions a concave mirror can form an image larger than the actual object?

When the object is kept at a distance equal to its radius of curvature
When an object is kept at a distance greater than its radius of curvature
When an object is kept at a distance less than its focal length
When an object is placed between the focus and centre of curvature

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