NDA Government Jobs Exams

An optician prescribes a power = – 0.5 dioptre. The corresponding lens must be a -
(a) convex lens of focal length 2 m (b) convex lens of focal length 50 cm
(c) concave lens of focal length 2 m (d) concave lens of focal length 50 cm

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NDA Other Question

An object is placed at the focus of a concave mirror. The image will be -
(a) real, inverted, same size at the focus
(b) real, upright, same size at the focus
(c) virtual, inverted, highly enlarged at infinity
(d) real, inverted, highly enlargted at infinity A current I flows through a potential difference V in an electrical circuit containing a resistance R. The
product of V and I, i.e., VI may be understood as -
(a) resistance R (b) heat generated by the circuit
(c) thermal power radiated by the circuit (d) rate of change of resistance