Physics
A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from the lens should an object be placed so as to obtain a real image on the screen?
Related Questions
Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by marking necessary angles. The critical angle of glass is 42°.
The diagram below shows two parallel rays A (Orange) & B (Blue) incident from air, on air-glass boundary.
(a) Copy and complete the path of the rays A and B.
(b) How do the speeds of these rays differ in glass?
(c) Are the two refracted rays in glass parallel? Give a reason.
(a) Infrared radiations are used in warfare. Explain with reason, why.
(b) A ray of light is incident at 45° on an equilateral prism in the diagram below.
- Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
- State the cause of the above phenomenon mentioned by you.