Physics
(a) A coin kept inside water [µ=] when viewed from air in a vertical direction appears to be raised by 3.0 mm. Find the depth of the coin in water. (b) How is the critical angle related to the refractive index of a medium?
Related Questions
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?
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.
A block and tackle system of pulleys has velocity ratio 4.
(a) Draw a labelled diagram of the system indicating clearly, the direction of the load and the effort.
(b) What is the value of the mechanical advantage of the given pulley system if it is an ideal pulley system?