Multiple Choice Question XXXXIX — 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. The image formed by a concave mirror

is always real
is always virtual
is certainly real if the object is virtual
is certainly virtual if the object is real

2. When light propagates in vacuum there is an electric field and a magnetic field. Which of the following is not true about these fields?

Are constant in time
Have zero average value
Are perpendicular to the direction of propagation of light
Are mutually perpendicular

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