Human Eye and Colourful World — Science STD 10 — Question

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.

Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses.

Why are the ‘danger signal’ lights red in colour?

What shape are your eye-lenses:

1. When you look at your hand?
2. When you look at a distant tree?

If the object is moved further away from the mirror, what changes are there in the position and size of the image?

When a light ray passes from air into glass, what happens to its speed? Draw a diagram to show which way the ray of light bends.

How does the thickness of the eye lens change when we shift looking from a distant tree to reading a book?

Why is a normal eye not able to see clearly the objects placed closer than 25cm?

The amount of energy transferred when 10C of charge passes through a potential difference of 20V is the same as the energy needed to raise a 2kg mass through a distance x. Find the value of x, take the value of g as 10m/s²

State two advantages of geothermal energy.