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| 1. |
where should an object be placed in front of a concave mirror of focal length 20 cm so as to obtain a two times magnified real image? |
| Answer» E Here is your answer---------------------------------------------30 cm before the lensMagnification M =-2 ( real and inverted image)M = v / u =-2V=-2u ....eq (1)From lens formula1/f = 1/v - 1/u .....eq (2)Given f = 20cmOn substitution of eq (1) in (2) we get U = - 30 cm ( it is negative from the sign convention)HOPE it helps Please mark as Brainliest | |