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.
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.
(i) (1) Visible region → Balmer series
(2) Ultra violet region → Lyman Series
(ii) Bohr’s formula is given by,