Physics
A block of glass is pushed into the path of the light as shown below. Then the converging point X will :
- Move away from the slab
- Move towards the slab
- Not shift
- Move towards the left side of the lens
Answer
Move away from the slab
Reason — When a converging beam of light enters a glass slab, the rays will bend towards the normal within the glass, and then bend away from the normal as they exit the glass back into air. This bending will cause the point of convergence (focus) to shift away from the glass slab.
Related Questions
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will:
- Decrease
- Increase
- Remain unchanged
- Depend on the surrounding temperature
The graph given below shows heat energy supplied against change in temperature when no energy is lost to the surrounding. The slope of this graph will give :
- Specific heat capacity
- Latent heat of fusion
- Latent heat of vaporization
- Heat capacity
(a) In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
(b) Name the class of the lever shown in the picture below :
Fill in the blanks :
(a) When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides …………… force necessary for circular motion.
(b) Work done by this force at any instant is …………… .