Fill in the blanks in the following paragraph to identify the properties of mirrors and lenses.
Lenses produce images through , but mirrors produce images through .
A mirror and a lens focus light at a point.
A mirror and a lens spread light apart.

When an object is heated it contracts. a. true b. false

Write the function getkthdigit(n, k) that takes a possibly-negative int n and a non-negative int k, and returns the kth digit of n, starting from 0, counting from the right

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.