Wave Optics Tes...

How does the red shift confirm that the universe is expanding?

Two sources of light of wavelengths 2500 $$\mathring {A} $$ and 3500 $$\mathring {A} $$ are used in Young's double slit experiment simultaneously. Which orders of fringes of two wavelength patterns coincide?

An astronaut is looking down on earth's surface from a space shuttle an altitude of 400 km Assuming that the astronaut's pupil diameter is 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size of about :

In case of linearly polarised light, the magnitude of the electric field vector.

doctor prescribes spectacles to a patient with a combination of a convex lens of focal length 40 em, and concave lens of focal length 25 em then the power of spectacles will be.

What change occurs, if the monochromatic light used in Young's double slit experiment is replaced by white light?

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wave length of light =500 nm]

Wavelength of light used in an optical instrument  are $$\lambda _1 = 4000 \mathring { A } $$ and $$ \lambda _2 = 5000 \mathring { A} $$ then ratio of their respective resolving powers(corresponding to $$\lambda _1$$ and $$ \lambda _2$$) is

Assertion: At the first glance, the top surface of the Morpho butterfly's wing appears a beautiful blue-green. If the wind moves the colour changes.
Reason: Different pigments in the wing reflect light at different angles.

Assertion: Radio waves can'be polarised.
Reason: Sound waves in air are longitudinal in nature.