Question

what are 3 techniques Dorothea lange uses in her photographs.

Answer 1

Hey mate, here is your answer :

Dorothea's photographic approach is characterized by an uncompromising ... " Migrant Mother" by Dorothea Lange.

Dorothea also tries not to show her presence.Dorothea Lange, (born May 26, 1895, Hoboken, New Jersey, U.S.—died October 11, 1965, San Francisco, California), American documentary photographer whose portraits of displaced farmers during the Great Depression greatly influenced later documentary and journalisticphotography.
Dorothea Lange (May 26, 1895 – October 11, 1965) was an American documentary photographer and photojournalist, best known for her Depression-era work for the Farm Security Administration (FSA).

Hope this answer helps you...