Which of the following types of mirrors has an optical axis? a convex mirror
a concave mirror
a double convex mirror
All of the choices are correct.

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above

6. an article, which costs rs. 850 is sold at a profit of 6%.what is the selling price ? -a) rs.900 b) rs. 901 c) rs. 890 d) rs. 905