Optics, Physics

Assignment Help:

A spider is hanging by means of its own silk thread directly above a transparent fixed sphere of r = 20cm .... the refractive index of material of sphere is root(2).... and height of the spider is 2r = 40cm .... an insect initially sitting at the bottom directly below the spider starts crawling along vertical circular path with constant speed pi/4 cm/s.. for how long will the insct be invisible to the spider. Assume that it crawls once around the circle .

Solution) Spider is able to see only half of the sphere which is topmost hemispherical surface. when insct enters in bottom hemispherical surface it becomes invisible for the spider. a/c question insct is travelling vertical circular path it travels pi/4cm in 1sec.then it will travel 2pi r dist i.e. 40picm in 160sec. hence it will travel pi r i.e20pi (half circle) in 80s.


Related Discussions:- Optics

Newtons laws of motion, what is the concept behind solving question wedge b...

what is the concept behind solving question wedge block system if block i made to constrain . how to solve such question by using line of action of force

Gold, Gold:                          Atomic number ...

Gold:                          Atomic number 79 Symbol Au Atomic weight 196.9665 discov

Emf and size, is there relation between emf and size os cell?

is there relation between emf and size os cell?

Force act on earth, Q. A rubber ball is dropped to the floor. What forc...

Q. A rubber ball is dropped to the floor. What force act on the ball to bounce? Does the Earth "bounce" too? Ans. The force of the Earth pushing back on the ball causes

Do glass or polymer transmits the radiation, Do glass or polymer transmits ...

Do glass or polymer transmits the radiation? There is not a simple answer since it will always depend on the last use and working conditions of the system. Usually speaking gla

Measurement of the thickness of a thin transparent mica slit, Q.   Describe...

Q.   Describe the method of measurement of the thickness of a thin transparent mica slit using Fresnel's Bi-prism. Give necessary theory. Draw suitable diagram. Measurement of

Dielectric constant of the material filling the gap, a) How much charge sho...

a) How much charge should be placed on it to raise its potential to 10,000 V. b)  A parallel plate capacitor having plate area 100 cm 2 and separation 1.0 mm holds a charge of

What is wheatstone bridge, What is Wheatstone bridge? Assume the condition ...

What is Wheatstone bridge? Assume the condition for which Wheatstone bridge is balanced.

Diamagnetism, In a non-uniform magnetic material, these substances move fro...

In a non-uniform magnetic material, these substances move from stronger parts of the field to the weaker parts.why?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd