Light – Reflection and Refraction — Science STD 10 — Question

Show the lateral displacement of the ray on the diagram.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:
At centre of curvature of the mirror.

Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.

If a milky of cloudy membrane grow over the eye lens, then which defect is the person suffering from?

State the principle of an electric generator.

State and define the S.I. unit of power of a lens.

It is desired to obtain an erect image of an object, using concave mirror of focal length of 12cm.
Where will the image of this object be, if it is placed 24cm in front of the mirror? Draw ray diagram for this situation also to justify your answer.
Show the positions of pole, principal focus and the centre of curvature in the above ray diagrams.

What are rods and cones in the retina of an? Why is our night vision relatively poor compared to the night vision of an owl?

Refractive indices of four mediaA, B, CandDare given below:

Medium	Refractive index
A B C D	1.33 1.44 1.52 1.65

In which of these four media is the speed of light:

1. Maximum, and
2. Minimum?

Explain why, the core of an electromagnet should be of soft iron and not of steel.