Physics
The diagram given below shows a lens as combination of glass prisms of different refractive indices. Copy the diagram and answer the following questions.
(a) Name the lens formed by the combination.
(b) Complete the ray diagram when AB is between optical centre and 2F.
Related Questions
Shyam is trying to balance a meter rod on his finger as shown in the diagram. Two weight 50 gf and 200 gf at 40 cm and 95 cm respectively and his finger at 70 cm.
Find the anti-clock wise moment and clockwise moment.
(b) Find the weight of meter rod.
(a) Define power of a lens.
(b) A child is using a spectacle with power of -2.5D. What is meant by the negative sign?
(c) Find the focal length of the lens used.
A ray is directed towards a lens as shown in the figure below. The lens is being depicted as a combination of a glass slab and two prisms.
Answer the following questions.
(a) Name the lens which is formed by this combination.
(b) What is PQ line called?
(c) Complete the ray diagram.
(d) The incident ray after refraction actually meet or appears to meet line PQ at a point. What is this point called?
If a light of a single colour is passed through a liquid having a piece of glass suspended in it, so on changing the temperature of the liquid, at a particular temperature, the glass piece is not seen.
(a) At what situation, the glass piece will not be seen?
(b) Why the light of a single colour is used?
(c) How can you define the term refractive index of a medium? State whether it can be less than 1 or not.