Question
A concave lens has a focal length 15 cm. If the object
is placed at 30 cm from the lens, what is the image distance?Solution
focal length f = -15 cm Distance of object u = -30 cm 1/ v = 1/f +1/u substituting these values in the lens equation we get, 1/v =1/-15 +1/-30 1/v =-3/30 v = -10cm Hence, the distance of the object from the lens is 10 cm and the negative sign signifies a virtual image.
__________ is a search tool which works by using the results of several other search engines.
A device that is used with a computer but is not an essential part of it.
_______ is not related to information technology?
When several "tasks" (also known as processes) may be run at the same time in an operating system, then system is called as
A ____________ is a set of computers connected together for the purpose of sharing resources.
Serial ports are also called
______________ is the attempt to obtain sensitive information such as usernames, passwords,...
Daisy wheel is which type of printer?
Which of the following term is used when a search engine returns a Web page that matches the search criteria.
________________ a free, multi-user, multitasking operating system which means that it allows a single or multiprocessor computer to simultaneously e...
Relevant for Exams:
