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

Is low attenuation is a sign of good quality fibers, Is low attenuation is ...

Is low attenuation is a sign of good quality fibers? Usually yes low attenuation is a sign of good quality fibers, but within lighting fiber optics the manufacturer's attenua

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

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

Fire, what causes glow in fire

what causes glow in fire

Evaluate refractive index of the material of the prism, Q. A prism is made ...

Q. A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°.What is t

Electronics, define capacitor filter briefly?

define capacitor filter briefly?

What is thermal neutrons, Fast neutrons can be changed into slow neutrons b...

Fast neutrons can be changed into slow neutrons by certain materials known as moderator's  when last moving neutrons pass by a moderator, they combine with the molecules of the mod

Wave motion, Derive an expression for the velocity of transerve wave in str...

Derive an expression for the velocity of transerve wave in stretched uniform string

How much work done in a constant velocity, A 40 kilogram girl climbs a vert...

A 40 kilogram girl climbs a vertical distance of 5 meters in twenty seconds at a constant velocity. How much work has the girl done? Ans: 2000 joules or 1960 joules work is

Gyroscopes, GYROSCOPES: PRINCIPLES Gyroscopes are rotating masses ...

GYROSCOPES: PRINCIPLES Gyroscopes are rotating masses (usually cylindrical in form) which are deliberately employed because of the particular properties which they demonst

Derivative of the sine function, Derivative of the Sine Function Extend...

Derivative of the Sine Function Extending a tradition of complex interrelations between the trigonometric functions, it turns out in which the derivative of the sine function i

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