Assertion: When white light fall on the compact disc, multicolours are seen after reflection.
Reason: CD disc behaves like a prism.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: If objective and eye lenses of a microscope are interchanged then it can work as telescope.
Reason: The objective lens of telescope has small focal length.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
In Young's double slit experiment, the two slits act as coherent sources of equal amplitude and of wavelength λ. In another experiment with the same set up, the two slits are sources of equal amplitude and wavelength λ, but are incoherent. The ratio of intensities of light at the midpoint of the screen in the first case to that in the second case is
2 : 1
1 : 2
3 : 4
4 : 3
In Young's double slit experiment, the distance between two slits is made three times then the fridge width will become
9 times
1/9 times
3 times
1/3 times
Light is incident normally on a diffraction grating through which the first diffraction is seen at 32°. In this case the second order diffraction will be
at 80o
at 64o
at 48o
there is no second order diffraction
Assertion: A white source of light during interference forms only white and black fringes.
Reason: Width of fringe is inversely proportional to the wavelength of the light used.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
If a street light of mass Mis suspended from the end of a uniform rod of length L in different possible patterns as shown in figure, then
pattern A is more sturdy
pattern B is more study
pattern C is more sturdy
all will have same sturdiness
Assertion: Standard optical diffraction gratings cannot be used for discriminating between different X-ray wavelengths.
Reason: The grating spacing is not of the order of X-ray wavelengths.
If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false
Both assertion and reason are false statements
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as
f ∝
f ∝ Z2
f ∝ Z
f ∝ Z3/2
When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of
interference
diffraction
dispersion
polarisation