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Optics
State Fermat’s principle. On the basis of this principle, show that when light passes
from a medium of lower refractive index to a medium of higher refractive index, it
bends towards the normal to the interface between the two media.
from a medium of lower refractive index to a medium of higher refractive index, it
bends towards the normal to the interface between the two media.
Optics
An insect is placed at the base( at centre ) of a cylindrical vessel and oil of refractive index u =2 is filled upto 10cm then water is poured in vessel upto height 20cm (length of water column 10cm ) if a convex lens of focal length 50cm is placed just above the surface of water then find the location of final image of the insect by this system if the insect starts moving up with speed 18m/s then what will be the speed of the final image just after its leaves the bottom
Optics
The wavelength of light diminishes n times ( n= 1.33 for water) in a medium.A driver from inside water looks at an object whose natural colour is green .He sees the object as
(1) green
(2) blue
(3) yellow
(4) red
(1) green
(2) blue
(3) yellow
(4) red
Optics
A ray of light is incident at angle 60° on one face of a prism which has an apex angle of 30° . The ray emerging out of the prism make an angel of 30° with the incident ray . The refractive index of the material of prism is
(1)√2 (2)√3. (3)1.5 (4) 1.6
(1)√2 (2)√3. (3)1.5 (4) 1.6
Optics
A square ABCD of side 1mm is kept at distance 15cm infront of the concave mirror . The focal length of the concave mirror is 10cm . The length of the perimeter of its image will be (1)8mm. (2) 2mm (3)12mm (4)6 mm
Optics
If a biconvex lens of power P is cut into 3 parts horizontally , then power of each part is?
Optics
A convex lens forms a real image of a point object at a distance of 50 cm from the convex lens. A concave lens is placed 10 cm behind the convex lens on image side. On placing a plane mirror on the image side and facing the concave lens, it is observed that the final image now coincides with the object itself. The focal length of the concave lens is?
a) 50 cm b)20cm c) 40 cm d) 25 cm
a) 50 cm b)20cm c) 40 cm d) 25 cm
Optics
Dear collogues; Our pump Burrefly diode lasers at 980 nm has been suddenly damaged . we do not know if the cause is optical or electrical damage, Can someone guide me how to find the cause of the damage? Are there any experiments to find the causes?
Optics
https://www.youtube.com/watch?v=UOHxNbxm-m4
Is it true what is being showed in the above video link?
Is it true what is being showed in the above video link?
Optics
A plane mirror is made of glass slab (refractive indec of glas =1.5) 2.5 cm thick and silvered on back.A point source is placed 5cm front of the unsilvered face of the mirror.What will be the position of final image?
