An object is held between two plane parallel mirrors inclined at `45^@` to each other. How many images do you expect to see?

How many orbitals do you expect to be present in the 5th shell?

What is the number of images of an object held between two plance parallel mirrors?

To form three images of an object, the angle at which two plane mirrors should be inclined to each other is

Two men Pa n dQ start with velocity u at the same time from the junction of two roads inclined at 45^0 to each other. If they travel by different roads, find the rate at which they are being separated.

An object is placed exactly mid-way between a concave mirror and a convex mirror. The radius of curvature for each of them is 0.2 m. The mirrors are placed face to face and are 0.3 m apart. Find the position of the image formed by two successive reflections, the first one taking place at the concave mirror and then at the convex mirror.

The optic axis of two polaroids are inclined at an angle of 45^(@) with each other. Unpolarised light of intensity I_(0) being incident on the first polaroid emerges from the second polaroid. Find the intensity of the emergent light.

12 cells each having the same emf are connected in series and are kept in a closed box. Some of the cells are wrongly connected. This battery is connected in series with an ammeter and two similar cells . The current is 3A when the two cells aid the battery and is 2A when the cells and the battery oppose each other. How many cells in the battery are wrongly connected?