Question

imagine what would happen if foreign companies stop ti invest in the indian maeket ?

Answer 1

Just looking at the last 38 years of stock market, (Sensex has been there only for 30 years starting 1986), we have had losses in only 10 years out of the 38 years, except for 2008 (The Global Financial Crisis) when the market fell down by more than 50%, never has the Sensex fallen by so much.
Also, the returns from the stock market > 45% have been more than 9 years out of the same 38 years, stock market returns greater than 25% but less than 45% for 7 years, which implies the Stock market has given returns greater than 25% for almost 16 years out of the 38 years.
Over 21 years of double digit returns (=>10% returns) from the Stock market in last 38 years is a decent statistics and confidence to have in it.

Answer 2

The market may be high/low, but there will be ample opportunities to invest in the individual stocks. ... There are thousands of listed companies in the Indian stock market. Even during the bull market, you can find good companies at a reasonable price. In short, focus on investing in companies, not the share market.