Discuss the conditions for film to appear bright and dark,when viewed from the other side of the film.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The film which appears bright in reflected system will appear dark in transmitted system and vice versa. Reason:The conditions for a film to appear dark or bright in reflected system is just reverse to those in the transmitted system.

A transparent cube of side 210 mm contains a small air bubble. Its apparent distance, when viewed through one face of the cube is 100 mm and when viewed through the opposite face is 40 mm. What is the actual distance of the bubble from the second face and what is the refractive index of the material of the cube?

A small black dot is marked on the surface of a glass spehre (mu=1.5) and is viewed from the other side.If radius of the sphere is 15 cm,find the position of the image of the dot.

A glass slab of thickness 12 mm is placed on a table .The lower surface of the slab has a black spot.At what depth from the upper surface will th espot appear,when viewed fromo above?The refractive index of glass =1.5.

Give a condition that the three vectors veca,vecb and vecc form the three sides of a triangle. What are other possibilities ?

A point charge +q , is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is