Which type of glass is used in the manufacturing of lenses and prisms?

Assertion: In the condition of obstructive jaundice,large amounts of unabsorbed fats are eliminated out of the body.
Reason: Entry of bile into the small intestine is prevented during obstructive jaundice.

The connecting link between ape and man is:

The velocity of a particle at time $t$ is given by the relation $v = 6t - \frac{t^2}{6}$. The distance traveled in $3$ seconds is,if $s = 0$ at $t = 0$.

For $|x| < \frac{1}{5}$,the coefficient of $x^3$ in the expansion of $\frac{1}{(1-5 x)(1-4 x)}$ is

$\frac{12}{3 + \sqrt{5} - 2\sqrt{2}} = $