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Optics
When angle of incidence is equal to the brewster’s angle, the reflected and refracted rays are perpendicular to each other. Show it mathematically
Optics
. A convex mirror for rear view on an automobile has a radius of curvature of 3 m. If a bus is located at 5m. from this mirror, find the position, nature and size of the image
Optics
In Young’s double slit experiment the separation between the slits is d and the wavelength of light used is 6000°A. If the angular width of the interference fringe formed at distant screen is 1° then the value of d is :
a)1mm b)0.05mm c)0.03mm d)0.01mm
a)1mm b)0.05mm c)0.03mm d)0.01mm
Optics
will higher frequency eject more electron than lower frequency?
Optics
A boy observes in a curved plate the image of a person's mobile sitting in his back side in a bus. The boy goes to person and informs him abot it. From which side of the plate boy observed the incident?
Optics
at what distance shuold an object be placed in front of convex lens of focal lenght 20 cm to obtain an image of double its size?
Optics
why does clear sky look blue?
Optics
A vertical pencil of ray s comes from bottom of a tank filled with a liquid. When it is accelerated horizontally with an acceleration of 7.5 m/s^2, the ray is seen to be totally reflected by liquid surface. What is minimum possible refractive index of liquid?
Optics
Two plane parallel plates having thickness of 3cm and 5cm and refractive indices of 1.5 and 1.8 respectively are piled together .A light beam incident on the first plate at an angle of 60' to the normal ,passes through the plates and emerges at the same angle .Find the displacement of the beam.
Optics
You have two lasers for bleaching in your office. One Nd:YAG with 100 μs pulse duration,
and one diode laser with 5 ms pulse duration. Both lasers are set to an average power of 1.5 W
and 15 Hz repetition rate.
a) Calculate the duty cycle of both systems.
b) Calculate the peak powers of both systems.
c) What dosage is given to a 16 mm length root canal (ISO 40) if you stay with the laser
treatment protocol for laser-supported endodontics: 4x irradiation of the canal.
Movement speed of the 200 μm fiber is 2 mm/s.
and one diode laser with 5 ms pulse duration. Both lasers are set to an average power of 1.5 W
and 15 Hz repetition rate.
a) Calculate the duty cycle of both systems.
b) Calculate the peak powers of both systems.
c) What dosage is given to a 16 mm length root canal (ISO 40) if you stay with the laser
treatment protocol for laser-supported endodontics: 4x irradiation of the canal.
Movement speed of the 200 μm fiber is 2 mm/s.
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#331389 on Nov 2022
#331389 on Nov 2022