List of top Physics Questions on Ray optics and optical instruments asked in Kerala SSLC Exam

An object is placed 20 cm away from a concave lens with a focal length of 10 cm.
  • [(a)] Calculate the distance to the image from the lens.
  • [(b)] Write down the characteristics of the image.
OR A convex lens forms a virtual image at a distance of 7.5 cm away from it. Focal length of the lens is 15 cm.
  • [(a)] Calculate the distance between lens and the object.
  • [(b)] Write any two instances where a convex lens is used in this manner.
Observe the figure where three coloured lights are made to fall on a screen.
  • [(a)] Which colours are labelled as A and D?
  • [(b)] Among the colours A, B, C and D identify the primary colours and write down the colours.
  • [(c)] There is a complementary colour pair among A, B, C and D. Pick them out and write down.
When passing through water droplets while forming rainbow light rays undergo:
  • [(i)] Increase in speed.
  • [(ii)] Internal reflection.
  • [(iii)] Total internal reflection.
  • [(iv)] Refraction.
Draw a ray diagram showing the formation of a virtual image by a convex lens.
The Sun appears red or yellow or orange during sunrise and sunset. But normally the sky appears blue in colour. Describe an experiment that would be helpful in explaining the cause of these phenomena. OR In winter, path of light through the gaps of the branches of trees can be seen clearly due to scattering.
  • [(a)] By what name is the phenomenon known where the path of light becomes visible in this manner? Through what type of medium does light travel when this occurs?
  • [(b)] What does the intensity of scattering depend on?