To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:

To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:
(a) 1.ess than 20 cm
(b) 30 cm
(c) 40 cm
(d) 80 cm

Correct Answer : Option (b) 30 cm

More Questions : When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in F1 and F2 generation pea plants will be respectively:

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