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

How many types of illuminators are there, How many types of illuminators ar...

How many types of illuminators are there? As there are no standards inside the industry, the term "type" is slightly confusing. Regading to power usage, the lamp illuminators c

Describe snells law, Out of ordinary and extra-ordinary waves, which wave o...

Out of ordinary and extra-ordinary waves, which wave obeys Snell's law?

.heart, name 3 things that will change how many times your heartbeats per d...

name 3 things that will change how many times your heartbeats per day..

Inertial and non inertial frame of refrence, What is inertial and non inert...

What is inertial and non inertial feame if refrence of reference?

Quantum particle confined to one dimensional box, A quantum particle confin...

A quantum particle confined to one dimensional box of width 'a' is in its first exited state. What is the probability of finding the particle over an interval of (a/2) marked symme

Universal Gravity, There is a point between the Earth and the Moon where th...

There is a point between the Earth and the Moon where the gravitational effects of the two bodies balance each other. Calculate the distance from the center of the Earth to this po

What is dielectric polarization, Q. What is dielectric polarization? T...

Q. What is dielectric polarization? The arrangement of the dipole moments of the permanent or induced dipoles in the direction of applied electric field is called polarisation

Illustrate the term temperature sensor, Illustrate the term temperature sen...

Illustrate the term temperature sensor? Temperature sensor: Bimetal coated onto the tip of fiber. When temperature increases the bimetal bends because of difference within t

What is the wavelength of that sound wave, When an orchestra is tuning up, ...

When an orchestra is tuning up, the first violinist plays a note at 256 Hz. a. What is the wavelength of that sound wave if the speed of sound in the concert hall is 340 m/s?

Explain concept of magnetism, Magnetism: 1. There are two types of magn...

Magnetism: 1. There are two types of magnetic pole north and south. 2. Like poles repel and unlike pole attract each other. 3. Magnetic substance produce magnetic field.

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