Light – Reflection and Refraction — Science STD 10 — Question

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:

Between focus and centre of curvature of the mirror.

Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? Why?

How does the resistance of an ohmic conductor depend on the applied voltage?

In an experiment to study the relation between the potential difference across a resistor and the current through it, a student recorded the following observations:
  

Potential V (volts)	1.0	2.2	3.0	4.0	6.4
Current I (ampere)	0.1	0.2	0.6	0.4	0.6

On examining the above observations the teacher asked the student to reject one set of readings as the values were out of agreement with the rest. Which one of the above sets of readings can be rejected? Calculate the mean value of resistance of the resistor based on the remaining four sets of readings.

With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab the emergent ray is parallel to the incident ray.

How can a magnetic field be produced without using a magnet?

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

Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of a convex. mirror. Mark on it the angle of incidence and the angle of reflection.

Why does the eye-lens not have to do all the work of converging incoming light rays?

List two properties of the images formed by convex mirrors. Draw ray diagram in support of your answer.