Force, Work, Power and Energy
Work, Power and Energy
Refraction of Light Through Plane Surface
Refraction of Light Through a Lense
Electricity and Magnetism
Electrical Power and Energy and Household Circuits
- Concept of Electrical Power and Household Circuits Numericals
- Household Circuits - Colour Coding of Wires
- Household Circuits - Three-pin Plugs
- Household Circuits - Safety Precautions
- Earthing (Grounding)
- Electric Switch
- Household Circuits – Main Circuit
- Electrical Energy and Power
- Electric Power
- Alternating Current (A.C.) Generator
- Current Electricity
- Resistors in Series
Make the correct for each of the following :
With reference to the fig, the refractive index of the glass block is
Make the correct choice for each of the following :
Which one of the five diagrams represents the path of a ray of light through a periscope?
Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism.
The given figure shows a point source P inside a water container three rays A,B and C starting from the source P are shown up to the water surface. (a) show in the diagram the path of these rays after striking the water. The critical angle for water-air surface is 48°. (b) Name the phenomenon which the rays A, B and C exhibit.
In the given figure PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS.
(a) state the special name given to the angle of incidence ∠PQN of the ray PQ.
(b) what is the angle of refraction for the refracted ray QS?
(c) name the phenomenon that occurs if the angle of incidence ∠ PQN is increased.
(d) The ray PR suffers partial reflection and refraction on the water-air surface. Give reason. Draw in the diagram the refracted ray for the incident ray PR and hence show the position of image of the object P by the letter P’ when seen vertically from above.
What device other than a plane mirror can be used to turn a ray of light through 180°? Draw a diagram in support of your answer. Name an instrument in which this device is used.