Human Eye and Colourful World — Science STD 10 — Question

In myopia:

The angle of reflection is equal to the angle of incidence:

1. Always.
2. Sometimes.
3. Under special conditions.
4. Never.

________are substances which do not allow electricity to pass through them:

The human eye forms the image of an object at its:

To obtain a magnification of, -0.5 with a convex lens, the object should be placed:

Long-sightedness: Hypermetropia Short-sightedness: 

The main constituent of petroleum gas is:

1. Methane.
2. Ethane.
3. Butane.
4. Propane.

If you focus the image of a distant object, whose shape is given below, on a screen using a convex lens,

the shape of the image of this object on the screen would be:

In the following ray diagram the correctly marked angle are:

Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed inside the coil. Find out the correct ones and write them down: