Human Eye and Colourful World — Science STD 10 — Question

A real image is formed by the light rays after reflection or refraction when they :
A. actually meet or intersect with each other.
B. actually converge at a point.
C. appear to meet when they are produced in the backward direction.
D. appear to diverge from a point.
Which of the above statements are correct?

The image of an object formed by a plane mirror is:

Select from the following the best experimental set-up for tracing the path of a ray of light passing through a rectangular glass slab:

Which of the following figures shows the correct magnetic field lines?

To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be:

Figure shows the magnetic field lines between the two faces A and B of two magnets.

Electrical resistivity of any given metallic wire depends upon:

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

The strength of the magnetic field between the poles of an electromagnet would be unchanged if:

Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?

1. The pupil becomes larger.
2. The lens becomes thicker.
3. The ciliary muscle relaxes.
4. The pupil becomes smaller.