Light – Reflection and Refraction — Science STD 10 — Question

As light from a far off star comes down towards the earth:

1. It bends away from the normal.
2. It bends towards the normal.
3. It does not bend at all.
4. It is reflected back.

The magnetic field lines produced by a bar magnet:

The image formed by a concave mirror is virtual, erect and magnified. The position of object is:

A real image of an object is to be obtained. The mirror required for this purpose is:

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure?

In case refraction of light through a glass slab:

The ultimate source of energy stored in fossil fuels is:

1. Moon.
2. Earth.
3. Sun.
4. Sea.

A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The special mirror is made up of three types of mirrors in the following order from top downwards:

1. Convex, Plane, Concave.
2. Plane, Convex, Concave.
3. Concave, Plane, Convex.
4. Convex, Concave, Plane.

The change in focal length of an eye-lens is caused by the action of the:

A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to determine its focal length. The teacher suggested him to focus a distant building about 1 km far from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen the student should slightly move the: