Recently Active Optics Questions

*Image* question of paper-2 jee-09 Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions φp = 2.0 eV, φq = 2.5 eV and φr = 3.0 eV, respectively. A light beam con ...

we all know what is a virtual image and what is a real image....... now in a mirror and a lens all the images whenever v is formed after the mirror it is a virtual image but in some cases even the negative images or the image ...

One side of radius of curvature R2 = 120 cm of a convex lens of material of refractive index μ = 1.5 and focal length f1 = 40 cm is silvered. It is placed on a horizontal surface with silvered surface in contact with it. Ano ...

I n the fig. shown a point object O is placed in air . A spherical boundary separates 2 media.AB is principal axis.The refractive index above AB is 1.6 & below AB is 2 The separation b/w the images formed due to refraction at ...

A bird is flying up at an angle sin-1 (3/5) with the horizontal .A fish in a pond looks at the bird . When it is vertically above the fish . The angle at which the bird appears to fly (to the fish) is: (nwater = 4/3) A) sin-1 ...

what will be the shape of image if circle of radius 10cm with its centre at 30cm from pole of mirror of radius of curvature 40cm? *Image* ...

*Image* an object is placed in medium 1 of refractive index n1 and height h1,above that there is another medium of the refractive index n2and height h2. and( n2>n1). and there is air around them i.e. above medium 1 nd belo ...

Q1 Prove that phase diffference between pattern and source in YDSE is π Q2 If slit plane is oscillate with SHM having eqn y=dsin(ωt), then find eqn of source??? ...

a hot body is placed in a room maintained at lower temperature .np. of photons will increase or decrease.....plz give reasons ...

can magnification due to convex mirror be negaive ?????(for both real and virtual objects) ...

give 4 application of lateral inversion. ...

it is a lens whose one surface is silvered.................tell me about sign convention..........first there is refraction then reflection and then again refraction...... we take left to right positive then what about sign c ...

*Image* the height of man is H........................so the minimum height of mirror is H/2..............BUT HOW DO WE KNOW THAT LIGHT FROM KNEE AND HEAD REACHES OUR EYE????????/ ...

Show that a mirror in the form of an ellipse with a point object at one focus will produce an image at other focus. ...

what is resolving limit of eye????????/ ...

in glass slab the faces are parallel or not ...

A plano-convex lens has thickness of 4cm. when placed on a horizontal table with curved suface in contact with, the apparent depth of bottom most point of the lens is found to be 3cm. If the lens is inverted, the apparent dep ...

how can we show that white light consists of 7 constituent colours? why the white light passing through a rect. block does not show dispersion? explain the reason why the white light shows the phenomenon of dispersion while p ...

how is d wavelength nd d frequency related 2 stoppin potential? xplain ur answer plz ...

1)can u xplain what exactly is optical path? ...

IN A YOUNG DOUBLE SLIT, EXPERIMENT , TWO NARROW VERTICAL SLITS PLACED .800mm APART ARE ILLUMINATED BY THE SAME SOURCE OF YELLOW LIGHT OF WAVELENGTH 589nm .HOW FAR ARE ADJACENT BRIGHT BANDS IN THE INTERFERENCE PATTERN OBSERVED ...

A point source of light S is placed at a distance 10cm infront of the centre of a mirror of width 20cm suspended vertically on a wall.An insect walks with a speed 10cm/s infront of the mirror along a line parallel to the mirr ...

In a Ramsden's Eye piece of effective focal length 3 cm the length of the eye piece is : a) 1.5 cm b) 8/3 cm c) 3 cm d) 4 cm FIRST TELL ME WATS THIS RAMSDEN EYE PIECE ...

64. A semiconductor is cooled from T1 K to T2 K. Its resistance (1) will decrease (2) will increase (3) will first decrease and then increase (4) will not change ...

The double-slit electron interference pattern appears when a large numberof electrons are accumulated at the screen. According to the quantum theory, the interference pattern appears (1) only if a beam of electrons are in tra ...

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WILL NEWTON`S RINGS BE SEEN MORE DISTINCTLY IN REFLECTED LIGHT OR TRANSMITTED LIGHT? ...

What Kind of star is the sun?????? 1) O 2) G 3) K 4) M Please answer...... ...

Hey this is K-CET 2008 ques. What is the ratio of intensities of the sounds of frequency 60 Db and 30 Db?????? 1) 100 2) 4 3) 1000 4)2 Please explain the logic....... ...

*Image* HLP ...