MCQ
Ray optics is valid, when characteristic dimensions are
- AOf the same order as the wavelength of light
- BMuch smaller than the wavelength of light
- COf the order of one millimetre
- ✓Much larger than the wavelength of light
✓
Answer
Correct option: D.
Much larger than the wavelength of light
d
Ray optics is valid when size of the objects is much larger than the order of wavelength of light.
Ray optics is valid when size of the objects is much larger than the order of wavelength of light.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A closely wound solenoid $80\; cm$ long has $5$ layers of windings of $400$ turns each. The diameter of the solenoid is $1.8\; cm$. If the current carried is $8.0\; A$, estimate the magnitude of $B$ inside the solenoid near its centre.
→The binding energy per nucleon is maximum in the case of
Two transparent media $A$ and $B$ are separated by a plane boundary. The speed of light in those media are $1.5 \times 10^{8}\,m / s$ and $2.0 \times 10^{8}\,m / s$, respectively. The critical angle for a ray of light for these two media is :
→An electric bulb is rated 60W, 220V. The resistance of its filament is
Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by
A long magnet is cut in two parts in such a way that the ratio of their lengths is $ 2 : 1. $ The ratio of pole strengths of both the section is
→According to Einstein's photoelectric equation, the graph of $K.E.$ of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope:
→A resonance circuit having inductance and resistance $2 \times 10^{-4} H$ and $6.28 \Omega$ respectively oscillates at $10\, MHz$ frequency. The value of quality factor of this resonator is .........
→$[\pi=3.14]$
In a Young's Double slit experiment, first maxima is observed at a fixed point $P$ on the screen. Now the screen is continuously moved away from the plane of slits. The ratio of intensity at point $P$ to the intensity at point $O$ (centre of the screen)
→Isogonic lines on magnetic map will have