A certain monochromatic light travelling in air is incident on a glass plate at a polarising angle. Angle of refraction in glass is found to be 32°. Calculate :
(i) the polarising angle;
(ii) refractive index, of glass.
(i) What is the use of a spectrometer ?
(ii) In a spectrometer, what is the function of:
(1) Collimator ?
(2) Telescope ?
Draw a labelled diagram of an image formed by a compound microscope with image formed at least distance of distinct vision.
Labelled diagram of an image formed by a compound microscope when image is formed at least distance of distinct vision.
An astronomical telescope consists of two thin convex lenses having focal lengths of 140 cm and 5 cm. The telescope is adjusted to be in normal adjustment,
(i) What is the angular magnification, i.e., magnifying power of the telescope in this set up ?
(ii) What is the distance between the two lenses equal to ?
A monochromatic source of light emits light of wavelength 198 nm. Calculate :
(i) energy of each photon;
(ii) Momentum of the photon.
(i) Name a series of lines of hydrogen spectrum which lies in :
(1) Visible region
(2) Ultra violet region
(ii) Write Bohr’s formula to calculate wavelength (X) of visible light, emitted by hydrogen, and explain the meaning of each and every symbol used.