Explain the condition for convexity and concavity.

Explain STP condition.

Explain formation of concave and convex surface of liquid on the basis of molecular force.

Answer the following questions What is mirage ? With a neat labelled diagram, explain the conditions under which it is seen.

Complete the given chart/ table : Following table explains the conditions during evolution of a star . Compare the conditions with the temperature , pressure of the gas (P) and the gravitational force (F_G) between gas particles and complete the following table .:

Spherical aberration of a convex and a concave lens respectively is

What is the difference between focal length of convex and concave length?

Explain the images formed by concave mirrors with respect to position of the image and object and also the Nature and size of image

Explain with diagram, Frenkel defect. What are the conditions for its formation? What is its effect on density and electrical neutrality of the crystal?

Answer the following questions : What is the sign of the power of a convex lens a concave lens ?