SSC Government Jobs Exams General Ability General Knowledge

When a parallel white light falls on a convex
lens, the colour meeting the axis close to the
optical axis will be -
(A) Red
(B) Blue
(C) Violet
(D) All at the same point

Read Solution (Total 1)

option d) All at the same point. That point is called Principal Focus
6 years agoHelpfull: Yes(0) No(0)

SSC Other Question

A concave mirror is placed on a horizontal table,
with its axis directed vertically upwards. Let O
be the pole of the mirror and C its centre of
curvature. A point object is placed at C. It has a
real image, also located at C. If the mirror is now
filled with water, the image will b

(A) real and will remain at C
(B) real and located at a point between C and infinity
(C) virtual and located at a point between C and O
(D) real and located at a point between C and O.
A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

Options
1) 8.5 km/hr
2) 10 km/hr.
3) 12.5 km/hr
4) 9 km/hr