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Syllabus

DERIVATION OF MIRROR FORMULA.

1- deviate the ray through 180 degree

2- deviate the ray through 90 degree

3- invert the ray ..

suggest me a working model project in physics

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?

we combine a convex lens of focal length f

_{1}and concave lens of focal length f_{2}and their combined focal length was F. the combination of these lenses will behave like a aconcave lens if:_{1}>f_{2}_{1}<f_{2}_{1}=f_{2}_{1}less than or equal to f_{2}difference between extrinsic and intrinsic semiconductor

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.

Q10. A force F is applied along a rod of transverse section area A. The normal stress to a section PQ inclined $\mathrm{\theta}$ to transverse section is

(1) $\frac{\mathrm{F}\mathrm{sin}\mathrm{\theta}}{\mathrm{A}}$ (2) $\frac{\mathrm{F}}{\mathrm{A}}\mathrm{cos\theta}$

(3) $\frac{\mathrm{F}}{2\mathrm{A}}\mathrm{sin}2\mathrm{\theta}$ (4) $\frac{\mathrm{F}}{\mathrm{A}}{\mathrm{cos}}^{2}\mathrm{\theta}$

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.

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?

two plane mirrors M1 amd M2 each have length 1m and are seperated by 1cm .a ray of light is incident on one end of mirror M1 at an angle 45 degree.how many reflections the ray will have before going from the other end?

derive F=R/2 for convex mirror

Q.103. The linear magnification is produced by a telescope having an objective of 50 cm and eyepiece of 5 cm focal length when used to read a scale 3m away is

1) 1.2

2) 2

3) 0.6

4) 4

Why the uv graph of concave mirror is parobilic and1/u and1/v graph is a linear graph???

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

derive lens maker formula by concave lens

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??

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 .

1.5/3

2.5/4

3.16/15

4.1.5

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.

prove that light waves are transverse in nature

Q.If a parallel beam of light of circular cross-section having radius 10 mm falls on the surface of glass slab $\left(\mu =\frac{3}{2}\right)$at an angle 30$\xb0$ with the surface of slab, then the radius of refracted beam is about(1) 12.5mm (2) 13.7 mm

(3) 14.5 mm (4) 16.2 mm

Explain Mirage formation?

how can we identify convex and concave lens without touching them?

_{2}will be : (in cm)(1) 5, 10, 15 (2) 5, 15, 30 (3) 5, 25, 35 (4) 5, 15, 25

practical reading of determination of refractive index of a glass slab using a travelling microscope

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

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

(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 × 10^{6}m, and the radius of lunar orbit is 3.8 × 10^{8}m.(1) 3 cm (2) 4 cm (3) $\frac{8}{3}$ cm (4) 6 cm

v versus u graph for convex and concave mirror

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 ?

what is the formula for finding lateral displacement?

Derive a relation between the focal length and radius of curvature of a Plano convex lens made of

What is concave mirror used as shaving mirror?

1)20cm 2)30cm 3)40cm 4)12cm

calculate speed of light in a medium whose critical angle is 30 degree.

two slabs with refractive indices 4/3 and 3/2 with thickness of 12cm and 8cm.calculate the effective refractive index....

plzz reply soon...

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?

Use the mirror equation to deduce that:

(a)an object placed betweenfand 2fof 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 ofimages that one obtains from explicit ray diagrams.]

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?

(1) 0

(2) 90$\xb0$

(3) 180$\xb0$

(4) 270$\xb0$

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 is incident on a plane mirror along the direction given by vector A= 2i-3j+4k. find the unit vector along the reflected ray. (Take normal to the mirror along the direction of vector B= 3i-6j+2k)

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.

What is the difference between crown glass and flint glass?

A thin lens has focal length f and its aperture has diameter d.It forms an image of intensity I.Now the central part of the aperture

upto diameter d/2 is blocked by an opaque paper .The focal length and the image intensity will change to?

Q42. (i) A ray PQ of light is incident on the face AB of a glass prism ABC (as shown in the figure ) and emerges out of the face AC. Trace the path of the ray. Show that

$\angle $i + $\angle $e = $\angle $A + $\angle $$\delta $

where, $\delta $ and e denote the angle of deviation and angle of emergence, respectively.

Plot a graph showing the variation of the angle of deviation as a function of angle of incidence. State the condition under which $\angle $$\delta $ is minimum.

draw a plot showing the variation of power of a lens with the wavelength of incident light.

The focal length of convex lens is 2.5 cm . Its magnifying power for minimum distance of distinct vision will be : -

1. 25

2. 52

3. 11

4. 1.1

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

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

draw a labelled ray diagram of compound microscope and explain its working.

A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at (a) the least distance of distinct vision (25 cm), and (b) at infinity? What is the magnifying power of the microscope in each case?

how does the focal length of a convex lens change if monochromatic red light is used instead of monochromatic blue light?

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?

Q. A sphere of glass (refractive index= 1.5) is of 20 cm diameter. A parallel beam enters it from one side. Where will it get focussed on the other side?

Explain it with the help of diagram.

plzz explain the construction and working og a compound microscope.... plzz

An object is placed at the principal focus of a concave lens of focal length f .Where will its image be formed?

how to draw Compound Microscope ray diagram step wise?how to draw Compound Microscope ray diagram step wise?

The central fringe of a interference pattern produced by light of wavelength 6000 Angstrom is found to shift to the position of 4

^{th}bright fringe after a glass plate of refractive index 1.5 is introduced . The thickness of the glass plate would be (in mu-m)1)4.8

2)8.23

3)14.98

4)3.78...........

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..

state and explain faraday's laws of electromagnetic induction. deduce an expressionfor the induced emf in a coilrotating uniformly in a uniform magnetic field.