(a) For what value of the angle of incidence, is the angle of emergence likely to be equal to the angle of incidence itself?
(b) Draw a ray diagram, showing the passage of a ray of light through this prism when the angle of incidence has the above value.
DERIVATION OF MIRROR FORMULA.
suggest me a working model project in physics
1)root of m1*m2
2)d/root of m1_m2
3)dm1*m2/m1_m2
4)d/m1_m2
what is the meaning of scattering of light?
Derive an expression for the focal length of the combination of two thin lenses when they are SEPERATED by a small distance?
difference between extrinsic and intrinsic semiconductor
(a) A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope?
(b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106 m, and the radius of lunar orbit is 3.8 × 108 m.
cbse XII physics investigatory project-
3.To find the refractive indices of (a)water (b) oil (transparent) using a plane mirror , a equiconvex lens and an adjustable object needle.
For the same value of angle of incidence the angle of refraction in three media A,Band C are 15 degree,25 degree and 35 degree respectively.in which medium the velocity of light be minimum?
1)root 2/3 2)3/2 3)root3/2 4)root3
how does focal length of a lens depends on the wavelength of light passed through?according to me the focal length should not change as focal length is a physical quantity of a lens so it should not change.
options:1)45 degree 2) 53 degree 3) 63 degree 4)75 degree
derive F=R/2 for convex mirror
Why the uv graph of concave mirror is parobilic and1/u and1/v graph is a linear graph???
derive lens maker formula by concave lens
A convex lens of focal length 20cm is placed coaxially with a convex mirror of radius of curvature 20cm. The two are kept 15 cm apart. A point object is placed 40cm in front of the convex lens.Find the position of the image formed by the combination .
1- deviate the ray through 180 degree
2- deviate the ray through 90 degree
3- invert the ray ..
please answer!!
Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3mm. If speed of light in material of
1.5/3
2.5/4
3.16/15
4.1.5
prove that light waves are transverse in nature
Explain Mirage formation?
options: 1)f1 greater than f2 2)f1 less than f2 3)f1=f2 4)f1 greater than equal to 4/3f2
how can we identify convex and concave lens without touching them?
a double convex lens made of glass of refractive index 1.5 has its both surfaces of equal radii of curvature of 20 cm each an object of 5 height is placed at a distance of 10 cm from the lens .find the position ,nature and size of the image
practical reading of determination of refractive index of a glass slab using a travelling microscope
(1) 3 cm (2) 4 cm (3) cm (4) 6 cm
v versus u graph for convex and concave mirror
what is the formula for finding lateral displacement?
Trace the path of the ray as it passes through the prism. Also, calculate the angle of emergence and angle of deviation.
Derive a relation between the focal length and radius of curvature of a Plano convex lens made of
erect and magnified image of an object.
(b) Using the above ray diagram, obtain the mirror formula and the expression for
linear magnification.
calculate speed of light in a medium whose critical angle is 30 degree.
The telescope is focused on a point which is 1 m away from the objective. Calculate the magnification produced and the length of the tube if the final image is formed at a distance 25 cm from the eyepiece.
What is concave mirror used as shaving mirror?
(a) For what value of the angle of incidence, is the angle of emergence likely to be equal to the angle of incidence itself?
(b) Draw a ray diagram, showing the passage of a ray of light through this prism when the angle of incidence has the above value.
Three rays of light red(R) ,green(G) and blue(B) are incident on the surface of a right angled prism normally on its perpendicular.The refractive indices for the material of tha prism for red,green and blue are 1.39,1.43,1.47 respectively.Trace the path of the rays through the prism.How will the situation change if the rays were falling normally on one of the faces of an equilateral prism?
(1) 5, 10, 15 (2) 5, 15, 30 (3) 5, 25, 35 (4) 5, 15, 25
A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 cm, and (b) a concave lens of focal length 16 cm?
draw a labelled ray diagram to show the formation of image in an astronomical telescope in the normal adjustment position and write the expression for its magnifying power.
a ray of light passes through an equilateral glass prism such that angle of incidence is equal to the angle of emergence.if the angle of emergence is 3/4 times angle of prism.calculate the refractive index of prism.
1) calculate the angle of incidence at AB for which the ray strikes the diagonal face at the critical angle
2)assuming n=1.352 calculate the angle of incidence at AB for which the refracted ray passes through the diagonal face undeviated.
PLS ANS FAST
Use the mirror equation to deduce that:
(a) an object placed between f and 2f of a concave mirror produces a real image beyond 2f.
(b) a convex mirror always produces a virtual image independent of the location of the object.
(c) the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.
(d) an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
[Note: This exercise helps you deduce algebraically properties of
images that one obtains from explicit ray diagrams.]
Q. If radii of curvature of both convex surfaces is 20 cm, then focal length of the lens for an object placed in air in the given arrangement is
(1) 10 cm
(2) 20 cm
(3) 40 cm
(4) 80 cm
What is the difference between crown glass and flint glass?
you are given following three lenses. which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope?
L power aperture
L1 3D 8cm
L2 6D 1cm
L3 10D 1cm
The objective of an astronomical telescope has a diameter of 150 mm and a focal length of 4.00 m.The eyepiece has a focal length of 25.00 mm. Calculate the magnifying and resolving power of telescope.(λ=6000 A for yellow colour).
A ray of light PQ is incident at an angle of 60 degree on the face of AB of prism of angle 30 degree . The ray emerging out of the prism makes an angle of 30 degree with the incident ray. Show that the emergent ray is perpendicular to the face BC through which it emerges. Also calculate the refrractive index of the prism material.?plz reply soon.
1)theta=40degree 2)theta=90degree 3)theta=98degree 4)theta=24.5degree
A thin equiconvex glass lens of refractive index 1.5 has power of 5D.When the lens is immersed in a liquid of refractive index "s" it acts as divergent lens of focal length 10ocm. the value if "s" is??
find the two values of object distance for which a convex lens of power 2.5 D will produce an image that is four times as large as the object.
draw a plot showing the variation of power of a lens with the wavelength of incident light.
A lens behaves as a converging lens in air and a diverging lens in water (u = 4/3). What will be the condition on the value of refractive index (u) of the material of the lens ?
if a covex lens is cut horizontally from the middle what will happen to its focal length?also consider the case of a concave lens.
a glass slab of thickness 4cm contains the same no of wavelength 5 cm of water when both are travnersed by same monochromatic light .calculate the r.i of glass
how does the focal length of a convex lens change if monochromatic red light is used instead of monochromatic blue light?
Q. What are the main considerations in the construction of an astronomical telescope and how are they achieved? Why are mirror objectives rather the lens objectives used in modern telescope? Clarify giving schematic diagram how the problem of partial obstruction of ray of light by the eyepiece and observer is overcome in the improved version of reflection telescope?
An object is placed at a distance of 15 cm from the convex lens of focal length 10 cm . on the other side of the lens , a convex mirror is placed such that its distance from the lens equals the focal length of the lens. The image formed by this combination is observed to coincide with the object itself. find the focal length of convex mirror..
Q. In a medium of refractive index 1.6 and having a convex surface has a point object in it at a distance of 12 cm from the pole. The radius of curvature is 6 cm. Locate the image as seen from air
(1) A real image at 30 cm
(2) A virtual image at 30 cm
(3) A real image at 4.28 cm
(4) A virtual image at 4.28 cm
An air bubble in a glass slab of refractive index 1.5 is 6cm eep as viewed from one face and 4cm deeo as viewed from the nother face. What is the thickness of the glass slab?
draw a labelled ray diagram of compound microscope and explain its working.
how to draw Compound Microscope ray diagram step wise?how to draw Compound Microscope ray diagram step wise?
plzz explain the construction and working og a compound microscope.... plzz
1)5*10^_8s 2)5*10^_10s 3)2.5*10^_10s 4)2.5 *10^_8s
Does critical angle depend on color of light? Explain.
Can you please explai without using the displacement formula...because displacement formula is not there in our portion and i didn't understand where it came from?