1.

At what distance from a concave mirror of focal length 10cm should an object be placed so that its real image is formed 20 cm from the mirror with ray diagram ​

Answer»

Explanation:1/f=1/u+1/v1/10=1/u+1/201/u=1/10-1/201/u=1/20u=20cmHence object must be placed at 2f to PRODUCE a REAL image ALSO at 2f.



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