Give reasons
Why are the mirrors fitted on the outside of cars convex?

Why are testes present outside the body cavity?

Give reasons : Why is the calorimeter made of copper ?

Give reasons : Why are the voices of men, women and children different?

Give scientific reasons: When you enter a warm room after being outside on a frosty early morning ,your spectacles ' steam up'.

Give reasons : Why is there a need for a standard unit ?

Give reasons: Why can our body conduct electricity?

Why are concave mirrors used in solar devices?

Give reasons : Why do farmers stick an iron staff into the ground while working in the field in rainy conditions?

An object is placed in front of a convex mirror at a distance of 50cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?