KVPY Government Jobs Exams

A convex lens of focal length 15 cm is placed in front of a plane mirror at a distance 25 cm from the mirror. Where
on the optical axis and from the centre of the lens should a small object be placed such that the final image
coincides with the object ?
(A) 15 cm and on the opposite side of the mirror
(B) 15 cm and between the mirror and the lens
(C) 7.5 cm and on the opposite side of the mirror
(D) 7.5 cm and between the mirror and the lens

Read Solution (Total 0)

KVPY Other Question
In the Arcitc region hemispherical houses called Igloos are made of ice. It is possible to maintain a temperature inside an Igloo as high as 20º C because
option
(A) Ice has high thermal conductivity
(B) Ice has low thermal conductivity
(C) Ice has high specific heat
(D) Ice has higher density than water A circular metallic ring of radius R has a small gap of width d. The coefficient of thermal expansion of the metal is d in appropriate units. If we increase the temperature of the ring by a amount T, then width of the gap
(A) Will increases by an amount dT
(B) Will not change
(C) Will increases by an amojnt (2R d) T
(D) Will decrease by an amount dT