## Mirror Mirror Relativity

Can you see your image when you are travelling at the speed of light?

Einstein’s Theory of relativity says:”The Laws of Physics

## Numerical Problems From Optics

1. When an object of height 4cm is placed at 40cm from a mirror the mirror forms the image on the object itself. If the height of the image is equal to the height of the object. Find out the focal

## Numerical problem from image formation by spherical mirror – optics

An object is placed 18cm in front of a spherical mirror. if the image formed is 4cm to the right of the mirror calculate the focal length and radius of curvature? what is the nature of the mirror?

(The

## Numerical Problems from Light

Madhu sent us the following problems from “Light”. Visitors can attempt to solve the problems by quoting the question number.

Most of the questions below are based on mirror formula and lens

## A Question on Evaporation

Arunabh Arun sent this problem. (Click on the image to see the enlarged version.)

## A problem from light for class X

Sudhanshu Misra posted:

“An object is placed at a distance of 10cm from convex mirror of focal length15cm; find the position and nature of image?”

Ans:

f= 15 cm

u=-10 cm

v=?

substitute the values

## Commonly asked questions for AISSE (CLASS X CBSE) Physics (Set – 1)

(Collected from Previous Board Question Papers and CBSE Sample Papers andGuess Papers made by experienced teachers)

Where does centre of curvature of a spherical mirror lie? Name two important properties of a magnet. How is 1 ohm related to ampere and volt? Draw neat ray diagrams to illustrate the formation of images due to a beam of light incident parallel to the principal axis of a (i) concave mirror, (ii) convex mirror in each case. Why is a series arrangement not used for connecting domestic electrical appliances in a circuit? Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use? Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed.(a) at F (b) Between F and O What is meant by the term, ‘magnetic field’? Why does a compass needle show deflection when brought near a bar magnet? Two lamps, one rated 60W at 220 V and the other 40W at 220 V, are connected in parallel to the electric supply at 220V.(a) Draw a circuit diagram to show the connections.

(b)Calculate the current drawn from the electric supply.

(c)Calculate the total energy